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The short distances between the two transitionmetal centers in the trinuclear complexes 3 are caused by cocomplexation of Ba2⊕: Cu2⊕:…︁Cu2⊕ 3.50, Ni2⊕…︁Ni2⊕ 3.42 Å. The macrocyclic ligand is formed as the complex 2 from o-phenylenediamine and 1 in the presence of Ba2⊕. Complexes 3, in turn, are obtained by treatment of 2 with copper or nickel acetate.
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Veggel et al. (1989) studied this question.
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